Family members say her 14-year-old sister was killed, and a live recording of the crash has gone viral.

Sanchez was driving a car that veered onto the shoulder on the outskirts of Los Banos in central California on July 21. Authorities said she overcorrected, causing the vehicle to swerve and overturn into a field, ejecting and killing her 14-year-old sister, Jacqueline.

Prosecutors said Sanchez was live-streaming on Instagram while driving and that the video, which includes images of the 18-year-old taking her hands from the steering wheel, will be a key piece of evidence in the case.